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' REQUEST FOR SITE CLOSURE <br /> General Mdls Facrlrty <br /> 2000 West Turner Road <br /> Lodi Caldar ua <br /> Delta Project No 40-92-708 <br /> Page? <br />' 15 feet below the around surface Next, Water Work of Escalon, California, collected a total of nine <br /> soil samples from the floor of the tank basin and submitted them to a certified laboratory for analyses of <br />' benzene, toluene, ethylbenzene, xylenes (BTEX), and high boiling point hydrocarbons (TPH as diesel <br /> No 6) Benzene was not detected in these soil samples, however, concentrations of TPH as diesel No 6 <br /> ranged from not detected to 820 parts per million (ppm) The approximate soil sample locations are <br /> presented in Figure 3 and the laboratory analyses results are presented in Table 1. <br /> 2.4 Subsurface Investigntion, May 1992 <br /> On May 12, 1992, three soil borings were advanced to 50 Leet below the surface and completed as ground <br />' water morutarnng wells 'YlW-1, MW-2, and MW-3 The locations of the ground water monitoring wells <br /> are shown in Figure 4 <br /> Soil samples were collected at 5-foot intervals from borings MW-1, MW-2, and MW-3 Soil types <br /> encountered beneath the site consisted predominantly of poorly graded sand with gravel, clay, and silt, <br /> well graded sand with silt, and sandy lean clay Field screening of the soil samples was thorough and <br />' included both visual inspections and analyses for the presence of organic vapors with an hNu <br /> photozonization detector (PID) Staining indicative of fuel contaminated soils was not present m the soil <br />' samples inspected. Organic vapors in the soil samples were not detected with the PID <br />' The soil samples collected from 35 feet beneath the surface in borings MW-1, MW-2, and MW-3 were <br /> submitted to a certified laboratory for analyses of BTEX and TPH as diesel No 6 BTEX or TPH as <br /> diesel No. 6 were not detected in the soil samples. The soil sample results are presented in Table 2 The <br /> results of Delta's subsurface investigation are presented in a report dated June 9, 1992 <br />' 2.5 Quarterly Ground Water Monitoring, May 192 through March 1993 <br /> Ground water monitoring wells MW-1, MW-2, and MW-3 have been monitored and sampled four tunes <br /> since installation in May 1992. The ground water table has been measured at the site between <br />' approximately 39 and 42 feet beneath the surface. Ground water table measurements recorded to date <br /> are compiled in Table 3 Ground water table measurements collected on March 23, 1993, were used to <br /> RPTO.76 TA <br />